switch modern-tests to use SWC instead of Babel for faster builds and simpler configuration

tools/modern-tests/babel.config.js

@@ -1,14 +0,0 @@
-module.exports = {
-  presets: [
-    [
-      '@babel/preset-env',
-      {
-        targets: {
-          node: 'current',
-        },
-      },
-    ],
-  ],
-  // This is needed to handle ES modules
-  sourceType: 'unambiguous',
-};

tools/modern-tests/jest.config.js

@@ -11,9 +11,14 @@ module.exports = {
   transformIgnorePatterns: [
     "/node_modules/(?!(execa|wait-on|is-docker|is-stream|human-signals|merge-stream|npm-run-path|onetime|mimic-fn|strip-final-newline|path-key|shebug-command|shebug-regex)/)"
   ],
-  // Use Babel to transform JavaScript files
   transform: {
-    "^.+\\.js$": "babel-jest"
+    "^.+\\.js$": ["@swc/jest", {
+      jsc: {
+        parser: { syntax: "ecmascript" },
+        target: "es2022",
+      },
+      module: { type: "commonjs" },
+    }],
   },
   // Playwright configuration
   globals: {

tools/modern-tests/package.json

@@ -6,8 +6,8 @@
     "test": "jest --config jest.config.js"
   },
   "devDependencies": {
-    "@babel/preset-env": "^7.21.3",
-    "babel-jest": "^29.0.0",
+    "@swc/core": "^1.15.18",
+    "@swc/jest": "^0.2.39",
     "cheerio": "^1.0.0-rc.12",
     "execa": "^5.1.1",
     "fs-extra": "^11.3.1",

tools/modern-tests/skeleton.test.js

@@ -116,8 +116,9 @@ describe('Meteor Skeletons /', () => {
         test: 'tests/main.js',
       },
       bodyStyles: {
-        'font-family':
-          'Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif',
+        'font-family': process.platform === 'darwin'
+          ? 'Inter, -apple-system, "system-ui", "Segoe UI", Roboto, sans-serif'
+          : 'Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif',
         padding: '10px',
       },
     }),